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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af032a2a77d63f0acf8039d04fbec4ca0444bdf69162021a7f26f4dfd357f50f' 
  AND token = 'USAlnza24dMx5lEpmbXre/Ggtx0je5kLLc+QwEoMJ6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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