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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7f0f8374acf627d4145676c1dd17bac3b78cb631a7b965321a6a9c5806003c' 
  AND token = 'QwxsCaX57LZc8ybLFo3jbSkpwXfUZzAYfZMly5uWOvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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