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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f40936ca232050f58dc836c4405ee00283448036bfa3fed9af02ff452cf1533' 
  AND token = '7d55XHMkVyv8GRhnKCnnN83nMh/AFcw5Fnxg5g6Ri44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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