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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1694e531d1ca4e7e896faa4402ade5090b23bc5fde67ea30c198af1b60b7c3f8' 
  AND token = 'uY4reAMBnsASTt52lY8Ps7xlHFlMY2OsDtuneX1qUok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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