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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3bb3d99df35e6d7d5ca16e9bdd50132598a9d4368d2c28832dc5b7ce8f90d64' 
  AND token = '8v8XqSex5piBShHlonkeEQdOqUoPy8GgkNX0J9pJ7K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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