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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0744266ff3d9b6f778da48e65759684f699031ff9390405f15a61e3b3a7bd0b7' 
  AND token = 'X70OZtx8TNQMpot5hAPqa4wKKxC1RYRWLlXFHKBcQTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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