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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f64ed87678a77bfd78c69e7218599d8ce3da79245822c543ed046ef415d6ad' 
  AND token = 'hE0VUjoqpnstS3vXLRclrD/150fbA4lnYTzqFI8Pa9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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