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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf39ad1e62413738da9df601aa8dd765a632b059409b439553ca494f5998b87' 
  AND token = 'J6pen2P5RVQ59Mrwrqw/fQMZ+C3onU4Ifqw03CbALHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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