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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc93c90485ba18d682a078636314c88a6843613526e842d3a9e8b38f554beaf' 
  AND token = 'V8gHbDeEudBLWrT5l+Dg1agxkcyR+DrR38OLc+qaSyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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