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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb2f488dc4381de6c17294ea0fd4c825b8f69eaecc8ef42aaa5d3380bdf5d73' 
  AND token = 'M2c8e+v3HjIJA4RTbx5w074cxKqA2fgGjWw63F5tCmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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