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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5810d7d0c696931ed86fde679202b1a0b578d851d40ac72e2cdbf6f0ac5c8beb' 
  AND token = 'PgiDTAf8hQs5cixgKo2GUSnXkaKePqWgdDRpcy8puFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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