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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c9bdcfc2bc0e6d392afa64aeca60734b6e1b97ec44c0bd8b031123a21ed361' 
  AND token = 'k75yIkLCQdv/vVId47L3pI9Cda76YjpzmTUSRCJ3xYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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