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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce6f1c8264f8eb944287ad092cbfdfa6d47f908f4d6e0ccbc7c24edc9bf5aeb9' 
  AND token = 'Bb2uoDpHaxXqalY3RgYyboGjWkzv9bF5EgRwpTAX4fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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