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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f60734c33ef49f778ac68ef89a2b744429bfb36ca7ef339cc4be13bc0cb8876' 
  AND token = 'X02Vy1lWbtAItSofV4Z5fV2yo0h95VVHYxTgjEwJYhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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