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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '746f9889535484c5dd854699f02dfa9e21d15bd33140e586f1d3f139214981cb' 
  AND token = 'b4ynt2VquX0y4kLDvD9AOrk2e8OXQfSffz3/WaD+drg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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