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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf280efbd9b0456ca0821c02c210f10d058aa56e5b49b3889359a5164e33761' 
  AND token = 'IRMIu5qSVHC8ueFe5nERb7XPic9oivI3AU0Lvbz88Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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