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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f285eccee119d10be6efe35d03793ffb4b0c43ed1a8df933e97db08f8ae4f21c' 
  AND token = 'lkXry2P3BWWML2LUpHLousDPoQST+vmAWpwIvgpzMC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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