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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865e2ab29db96339ad1451454058b971dea4603c9f459acfa5a94d1cca731d52' 
  AND token = 'PL+wrdi4D4wAq+RXX03xo2U7WSpMYUSQ1Yx0DL/A070=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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