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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1b902a9161cc9bb7281bf089e4018a30e1e28fd68e0d7a87e5a0840e9a3659' 
  AND token = 'w3aBk9pmrb9LmeE557eZthbbzSP54Ljf/NmAF1ot2bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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