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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b837a5d0785521be685e76e10e62fe28e76c7373ff134dd9af501f3001897be0' 
  AND token = 'Oqtz1G1a27EM3vtOom904yAHNVea/gTuVXHfBCBkXDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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