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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee44e2eeb3a41ba9141908c904521bc7769ca5d3552baf6b69d69d4cb180eec' 
  AND token = 'iBARJWAPvaU/LxwSJjFZ4VDBK1wkO2Ingj7NSSAj+tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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