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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24fc3eda4358ed28c85b8b94559ae3a02c0b4c68de45c69bfadcc83c96142b80' 
  AND token = '+uNCBZhByz/nlHQoonVUJxQeql7/KSI4VyXe9a97Ks8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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