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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64aec03d29854cc690556f44d15ffe11689f1310afe6beadfc2e0681c3666a4f' 
  AND token = '9vADu15X4+itTFWjNfMvLQbUuiP1cb1aVlP1ak2y3WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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