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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca771c61a76dbf06d76b79741a2f36d936219350ec1807b061f3500833966525' 
  AND token = 'D4Th0UFEz1GXqBv6MKtuWOH6TbtV0+G00QE6x51FSDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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