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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee9afaaddbf36c6510ae5cca728e4d99f04326687d226da185b710ba3e6b02c' 
  AND token = '8IyoMzTWOZM+V6Z1YhJVvKUyRaMZQ1tUO7o4LJU8tg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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