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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48927202d8d9ed2a17e08b1b2b603cf50b6211dc470ba8802907d2fb499ed42' 
  AND token = 'O1ejOHAMGL5m2bMLGt17Tg3RSEYxs5fBaLIHwRrnuds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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