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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf75c497f1c6c3813b87c07dca8a1b1701fa7709997070b67fbfe5253bc16f9' 
  AND token = 'fXSH1lbNCwlw3zYb5BX3KyJY9OB+Rh9fdC28prncflA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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