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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee1121ee6ae2a5fa257be886b705945a4b4138b44eb3b0b9750a7fd3199c9c8' 
  AND token = 'A0OSAJ7NXccaDLuEStSrwb5suQ6gTiyFxOKGopT7Mro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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