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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df544513c017253362859d5b8e8e1d25ed59780468a8c6eaf31eae30a01ca01a' 
  AND token = 'IKBFEgr3AciSZfUa53GK+3v2xkBGrIYEdt9RKI4CNFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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