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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9dfd7ff1b403c9fe9096e2f0646a069e6e2b2359c5ba26bbb05e45ff3b73d3' 
  AND token = 'tfOk3x0CTuEf+i7/ggmMR0+TroFF6pFUZRQ0JpBdkHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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