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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512d493592bb8cd3ca50763308463aaf3c9b13369b1deb93ae264c48b32c3e52' 
  AND token = 'cBnIZ4tglKYIRg2Mi55eb6dAfEChinz3Sk40BZKez4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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