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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ef3b0a09f2dbc650eeb8d85716e2edb02f094b9519241fc9fb3e454694455f' 
  AND token = 'EAbSGWi3Pw8iADAtH51pnBk5S3ildXx6QwusJIcAGIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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