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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970ca97df8c852d07602abcdab90389956ce762a0d4016e84938783b3f08b3d5' 
  AND token = '3yR8Nbbq2h3OuRPAnrhrgAFW1iMtQ4Tm1KDzS+cyjFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}