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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '640864525f391fc2997a087d8684c6be01e46b72ea31c0969a4dcabbe90ca910' 
  AND token = 'mfIX6yBMJFaIpYMGBkX8bVJlDZ7EhklmK7ukS2wKZpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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