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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff4a04ac4ec7f946960087d18a6ef0d258acca34fae649e156356ed1bd01cb3' 
  AND token = 'vYEc+yysKTZesWxSfR9liopU3T7ki4Wv0i58ybWIHbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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