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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4746a7693ebaf2d33358bae7f25b9cafcc57fb8ff024ff4177e7bf658345c629' 
  AND token = 'WH14zmO1c3aJGZciqQ240thunsaFfC2EnTpGUK6BxSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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