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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8471a24e15beb77faa2a0fe4e3952820fc6c57f08d6b054c530705c783ba036' 
  AND token = 'L70wwsoB/M7cdCNCtkCS9SvZStpPE68/oaJfwhIM2+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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