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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196deb99dba290e143d3b3add45275b63e03da1db4944b74710e649d06cae886' 
  AND token = '58gE++ZXZ9+GGbUhVkBig5UKruiK94Zi9UDKaWMEPUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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