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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934a696a63d1533e6860de239c2d2d07dcd11bf6f2584d6626046610dc613ca4' 
  AND token = 'cy1sCUmgu8W3TBXLs25xcl3F42wq142xxFAcXB7o4yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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