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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a607a47960a53d91673085e514fb0f1513532d3c695cdbb524bb82ba89dca1a' 
  AND token = 'ilVKeeKRGL5Bik+t4YD+vFIUrfn1xU7uK245IZ4/lK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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