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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c0573ec0e9bceb700af1e1804ee3344626093e6f21f801abad9dc8e15c8110e' 
  AND token = 'ryoie89ch/p92bFdd+cTatLOOht96tpANrtMgx6rE/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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