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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0c4031b2ea2b453c55e09e7b066c515ab949680b386ddb3ceae5775f9f06c4' 
  AND token = 'N42bjLqm5zmbDvcIuFnG+EZvi5wtnlDfbGiyt71wNDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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