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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aaa43988bc87e9733da271dd52fd915b664d8e99d22c2e3ec08e3accd130e40' 
  AND token = 'InaL22XTKh6B5c3da0YgWTUoul3twlguOPGVra1Nb2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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