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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f765d92e067784c50d98de897a51339e8b1f321253ebcbd0f7d5274a58719b1' 
  AND token = '8GlT/AsYLwmnpAaT4d40ppBke8Ac7HbxdLR9WORO1uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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