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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f88e9a6ee3318f936d8799bb923f202745f102fdfaef9bf91a065b59399b09' 
  AND token = '4btGj76rw2o/eJydhgvhWtpJGyNWTy/8gbZVtyIvito=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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