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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48af287d74811f0750529b6811742063bb9a3d87fe180fcd96c364ebcf3ee5bd' 
  AND token = 'Q2eIe7PFMoCk2Ho1NOwkKgS646NavR18J7mFpntj8XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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