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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec50f7959b1ef123fd4ea29bda99dec2cb9eab8ffd4dc86c3ce3dd2ca6e2e247' 
  AND token = 'LLYBupVYSdcpCCtK4L5n7nDhgwrL/xG4Rq8Rxqj2Xbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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