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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced2f9b693753fb7e745b63741e97a0382bdde791c60949277b279b27c2a033d' 
  AND token = 'eh9LrNskWo6ZlcY1As7bY+Sp3dMKFkankYDxpVi3jb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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