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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82378c260433faee0fa90543a03c94c58658f8466860b1511c141b48720f1ad' 
  AND token = 'sIM58tW3azgeDHm4WswJWfJ/HTeQBFnXZlUF2cfb790=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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