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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd774dc136f280435f5f2a7bed879084212021c1085c1e48c9e52a9ff68db905a' 
  AND token = 'puXghfJsP41sgr3nJuz7/5rUSe4KzP+OY1HpM3CyXYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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