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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a773a17c0f760ca506255f68611358429a16188ad8131e48aef6e788ce508e10' 
  AND token = 'EUoaUa8b1KxlkjpBIAmYLBHb5SsSpOg5/0PLk4EECcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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