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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336ed1bdfdbf365c7867d84c06f62db820907ef233a4543f703c230603ae3cc1' 
  AND token = '6p4gCYeKcW3aNc8ORAGI60nccOXxuzYsN68Y7ojlLic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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