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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '647f2157240188b39c7d4f2698c59821f3ef6c8c9289830814cb0b2fbb29f040' 
  AND token = 'k5jTcFhXdrD7+AZAStUt4tPkEXgihM1Ghh7sNrGZAhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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