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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf9f97a12e8064284106bde00db4d35cb75a9ca52b4476827d75e773a53fd3d' 
  AND token = '7r/QJDLALpL+m/twIjc/8EAYh36xnWa8in0ZQ2bCegU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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