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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056af9a2c8f3fb4e39334307537b92a1601a287df5355eeaf0861c4944bab9d8' 
  AND token = 'KSlrVk1o9NEuqgTdgGoTgbggFSpyloV54JlefMIl9u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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