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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82dd13a063e6d1a61d45c84b3ef107f26703257f1fa1795a9fd9024b20b5c96a' 
  AND token = '77S1Heupfcb6eTWFErje+95bdtVGzoFeBRK29QlV5oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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