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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3504a798ded27f78e70aa615a01652b99fd83492b202143c60f8492a6957df7' 
  AND token = 'ssSIQP2Mu6awxKmnlzznzLvrE735nhobRXuZhFImHhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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