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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13865804870a45bedb2d3d7a126614bd51b8d74c1e6115511fbe60c96eb5e96' 
  AND token = 'kRyLEXGs5+IDWyqVXu587Kh2JL+AL/e5jdEi4DSPsC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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