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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2eb628cb47f1be01d8fbe57e13e0b9f90250fe145dbb5efcddd5fa23337d46e' 
  AND token = 'xRiBA0TX82ali9evxYkQtSUHEl+ajheEPd2KIoOa170=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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