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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849c69f2af9544f6218c45ffb6c8aa79448203034f93d94c41263b4aa06066a8' 
  AND token = 'J+hRW08dGusImd9kHR34Z++0dUn5fND67VFu25x10s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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