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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7afcd461b4156b019ca2caaede54cf6fd907ad9c723ce804bb3b7052b29148e' 
  AND token = 'Xpzn5BgRJZgSg6mfp+ME4lKyrqcMiW/WEESe5c/ODsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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