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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418142e984c58416e9f1d479bcc6087054ad92e2a9e770c014c976bd8a1e0286' 
  AND token = '7QURmx6vRsi0mXreeimXxYkvie2EL/cNAMFr81h5V4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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