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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f744a1d3b2ad1432f010d6f0ef5bc2ae66b7bd23c4a224a62315342849f37fa' 
  AND token = 'MD2Fe90aEi+kLB/O5EvlRSzofoJD1BwCCaTeh1JB+Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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