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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33a2b2eada05767530d99f41cff43ced536e5406cb99e23f077e4a241442f54' 
  AND token = '1G6Ay8i5jApdgumt49Qco0WOCi8cqvgklfDPpWOQIMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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